The Thunderlide CV carburetor new calibration set for Harley Davidson FX models from the years 1990 to 1994 comprises a large number of components to optimize engine power. A slight slide improves the reaction of the throttle and contributes to reducing fuel consumption. The set includes various main nozzles, a equal pressure membrane, a needle, a injection nozzle, an accelerator pump ball, a mixed pipe and necessary drills for adjustments. In addition, security clips and a assembly kit are included. Comprehensive instructions make it easier to install and finish the carburetor.